Wireless broadband communication method, device, and system to establish a bearer between a user equipment and a small cell

ABSTRACT

Embodiments of the present invention provide a wireless broadband communication method, device, and system, so as to increase bandwidth and capacity of mobile broadband communications and at the same time lower cost. The method provided in an embodiment of the present invention includes: establishing, by a macro base station, a Radio Resource Control RRC connection with a user equipment UE; receiving, by a small cell (small cell), a configuration message sent, through a wired or wireless interface, by the macro base station; and establishing, by the small cell, a user plane connection between the small cell and the UE based on the RRC connection and the configuration message, and establishing a data bearer with the UE on the user plane connection.

This application is a continuation of International Application No.PCT/CN2012/077053, filed on Jun. 16, 2012, which claims priority toChinese Patent Application No. 201110199326.8, filed on Jul. 15, 2011,both of which are hereby incorporated by reference in their entireties.

TECHNICAL FIELD

With the development of science and technologies, people haveincreasingly high requirements for mobile communications services andquality. The research focuses on improving transmission quality andlowering operating expense using limited spectrum resources.

At present, mobile communications based on wireless technologies havefound wide applications in the markets for indoor applications andoutdoor applications. Wireless technologies are used in such a greatscale, and currently the driving force for the development of mobilecommunications also comes from the demands for broadband data services,which causes a considerable impact on public mobile wireless networks,especially on long term evolution technologies (LTE) that are alsotargeted in indoor scenarios.

In the prior art, the logical architecture of an LTE Home eNodeB isconnected to a mobility management entity (MME) through an S1 interface.Because the number of LTE Home eNodeBs is large, if LTE Home eNodeBs aredirectly connected to an MME through an S1 interface, both theperformance and cost of the MME are influenced significantly. Therefore,by standard, one intermediate node, that is, one Home eNB gateway (HeNBGateway, HeNB GW), is added between an MME and an LTE Home eNodeB toavoid too many S1 interfaces on the MME.

As for functions, a Home eNB has functions identical to those of acommon base station, and fails to meet the demands in increasingbandwidth and capacity and at the same time lowering cost innext-generation mobile broadband communications technologies.

BACKGROUND

With the development of science and technologies, people haveincreasingly high requirements for mobile communications services andquality. The research focuses on improving transmission quality andlowering operating expense using limited spectrum resources.

At present, mobile communications based on wireless technologies havefound wide applications in the markets for indoor applications andoutdoor applications. Wireless technologies are used in such a greatscale, and currently the driving force for the development of mobilecommunications also comes from the demands for broadband data services,which causes a considerable impact on public mobile wireless networks,especially on long term evolution technologies (LTE) that are alsotargeted in indoor scenarios.

In the prior art, the logical architecture of an LTE Home eNodeB isconnected to a mobility management entity (MME) through an S1 interface.Because the number of LTE Home eNodeBs is large, if LTE Home eNodeBs aredirectly connected to an MME through an S1 interface, both theperformance and cost of the MME are influenced significantly. Therefore,by standard, one intermediate node, that is, one Home eNB gateway (HeNBGateway, HeNB GW), is added between an MME and an LTE Home eNodeB toavoid too many S1 interfaces on the MME.

As for functions, a Home eNB has functions identical to those of acommon base station, and fails to meet the demands in increasingbandwidth and capacity and at the same time lowering cost innext-generation mobile broadband communications technologies.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a wireless broadbandcommunication method, device, and system, so as to increase bandwidthand capacity of mobile broadband communications and at the same timelower cost.

An embodiment of the present invention provides a user equipment. Athird connection establishment unit is configured to establish a RadioResource Control RRC connection with a macro base station. Areconfiguration message receiving unit is configured to receive an RRCreconfiguration message sent by the macro base station to the UE afterthe third connection establishment unit has established the RRCconnection. A second connection and bearer establishment unit isconfigured to establish a user plane connection with a small cell (smallcell) through an air interface based on the RRC reconfiguration messagereceived by the reconfiguration message receiving unit, and establish adata bearer with the small cell on the user plane connection.

An embodiment of the present invention provides a wireless broadbandcommunication method. A user equipment UE established a Radio ResourceControl RRC connection with a macro base station. An RRC reconfigurationmessage sent by the macro base station to the UE is received after theUE has established the RRC connection. The UE establishes a user planeconnection with a small cell through an air interface based on the RRCreconfiguration message, and a data bearer with the small cell on theuser plane connection.

An embodiment of the present invention provides a macro base station. Asecond connection establishment unit is adapted to establish a RadioResource Control RRC connection with a UE. A configuration messagesending unit is adapted to send an RRC reconfiguration message to the UEthrough a wireless interface, and send a configuration message to asmall cell through a wired or wireless interface after the secondconnection establishment unit has established the RRC connection. TheRRC reconfiguration message and the configuration message are used forthe small cell and the UE to establish a user plane connection.

An embodiment of the present invention provides a wireless broadbandcommunication method. A macro base station establishes a Radio ResourceControl RRC connection with a UE. The macro base station sends an RRCreconfiguration message to the UE through a wireless interface and aconfiguration message to a small cell through a wired or wirelessinterface. The RRC reconfiguration message and the configuration messageare used for the small cell and the UE to establish a user planeconnection.

An embodiment of the present invention provides a small cell. Aconfiguration message receiving unit receives a configuration messagesent, through a wired or wireless interface, by a macro base station. Afirst connection and bearer establishment unit is adapted to establish auser plane connection between the small cell and a UE based on theconfiguration message received by the configuration message receivingunit, and establish a data bearer with the UE on the user planeconnection.

An embodiment of the present invention provides a wireless broadbandcommunication method. A small cell receives a configuration messagesent, through a wired or wireless interface, by a macro base station.The small cell establishes a user plane connection between the smallcell and a UE based on the configuration message and establishes a databearer with the UE on the user plane connection.

An embodiment of the present invention provides a wireless broadbandcommunication system, which includes the foregoing small cell and theforegoing macro base station.

Compared with the prior art, in the method, device, and system providedin the embodiments of the present invention, a user equipment UE firstestablishes a Radio Resource Control RRC connection with a macro basestation, and the macro base station then performs resource configurationon a small cell, and establishes a user plane connection between the UEand the small cell, so that the effect of traffic splitting for userplane data is achieved, bandwidth and capacity of mobile broadbandcommunications are increased, and cost is lowered.

BRIEF DESCRIPTION OF THE DRAWINGS

To illustrate the technical solutions in the embodiments of the presentinvention or in the prior art more clearly, the following brieflyintroduces the accompanying drawings required for describing theembodiments or the prior art. Apparently, the accompanying drawings inthe following description show merely some embodiments of the presentinvention, and a person of ordinary skill in the art may still deriveother drawings from these accompanying drawings without creativeefforts.

FIG. 1 is a flow chart of a wireless broadband communication methodaccording to an embodiment of the present invention;

FIG. 2 is a network topology diagram according to an embodiment of thepresent invention;

FIG. 3 is another network topology diagram according to an embodiment ofthe present invention;

FIG. 4 is a structural diagram of a protocol stack according to anembodiment of the present invention;

FIG. 5 is a structural diagram of another protocol stack according to anembodiment of the present invention;

FIG. 6 is a structural diagram of another protocol stack according to anembodiment of the present invention;

FIG. 7 is a structural diagram of another protocol stack according to anembodiment of the present invention;

FIG. 8 is a diagram of signaling interaction of a wireless broadbandcommunication method according to an embodiment of the presentinvention;

FIG. 9 is a diagram of signaling interaction of a wireless broadbandcommunication method according to an embodiment of the presentinvention;

FIG. 10 is a flow chart of another wireless broadband communicationmethod according to an embodiment of the present invention;

FIG. 11 is another network topology diagram according to an embodimentof the present invention;

FIG. 12 is another network topology diagram according to an embodimentof the present invention;

FIG. 13 is a structural diagram of another protocol stack according toan embodiment of the present invention;

FIG. 14 is a structural diagram of another protocol stack according toan embodiment of the present invention;

FIG. 15 is a structural diagram of another protocol stack according toan embodiment of the present invention;

FIG. 16 is a structural diagram of another protocol stack according toan embodiment of the present invention;

FIG. 17 is a diagram of signaling interaction of another wirelessbroadband communication method according to an embodiment of the presentinvention;

FIG. 18 is a structural diagram of a small cell for wireless broadbandcommunication according to an embodiment of the present invention;

FIG. 19 is a structural diagram of another small cell for wirelessbroadband communication according to an embodiment of the presentinvention;

FIG. 20 is a structural diagram of a macro base station for wirelessbroadband communication according to an embodiment of the presentinvention;

FIG. 21 is a structural diagram of a UE according to an embodiment ofthe present invention;

FIG. 22 is a structural diagram of another UE according to an embodimentof the present invention;

FIG. 23 is a structural diagram of a wireless broadband communicationsystem according to an embodiment of the present invention;

FIG. 24 is a structural diagram of another wireless broadbandcommunication system according to an embodiment of the presentinvention;

FIG. 25 is a flow chart of another wireless broadband communicationmethod according to an embodiment of the present invention; and

FIG. 26 is a flow chart of another wireless broadband communicationmethod according to an embodiment of the present invention.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

FIG. 1 is a flow chart of a wireless broadband communication methodaccording to an embodiment of the present invention. This embodimentincludes:

Step 101. A macro base station establishes a Radio Resource Control RRCconnection with a user equipment UE.

Step 102. A small cell receives a configuration message sent, through awired or wireless interface, by the macro base station.

Step 103. The small cell establishes a user plane connection between thesmall cell and the UE based on the configuration message, andestablishes a data bearer with the UE on the user plane connection.

The execution subject in this embodiment of the present invention is asmall cell. A small cell may be a picocell (Pico), a femtocell (Femto),a low mobility cell (Low Mobility, LoMo), other local wireless accesspoints AP, or a UE having a device-to-device (D2D) function. In thisembodiment, for example, the small cell is a LoMo.

A macro base station is mainly adapted to implement a control planefunction of the UE, which includes a mobility management function of theUE. The LoMo is mainly adapted to bear an indoor low mobility dataservice, so as to implement a user plane function. Specifically, aseparate transfer manner is adopted, in which different paths are usedfor transfer of user plane data and transfer of control plane data foran air interface. That is, a link from the LoMo to the UE only transmitsuser plane data, whereas control plane signaling from the LoMo to the UEis established through a link from the macro base station to the UE.

As shown in FIG. 2, the macro base station is directly connected to theUE through an air interface without a LoMo. The LoMo establishes an RRCconnection through such an interface between the macro base station andthe UE. The macro base station is connected to the LoMo through a wiredor wireless interface. The wired interface includes: an S1 interfacebetween a base station and a mobility management entity MME, and/or anX2 interface between base stations, and/or a common public radiointerface CPRI, and/or an Iub interface between a wireless networkcontroller and a base station. The LoMo receives, through such aninterface, a configuration message sent by the macro base stationthrough a wired or wireless interface. The wireless interface includes:a Uu interface between a base station and a UE and/or a microwaveinterface for base station transmission. The data bearer between theLoMo and the UE is configured by the foregoing interface between themacro base station and the UE.

After receiving the user plane data of the UE through the data bearer,the LoMo can send the user plane data to the macro base station throughthe wired or wireless interface between the macro base station and theLoMo in FIG. 2, so as to enable the macro base station to forward theuser plane data of the UE to a core network element. Alternatively, theuser plane data of the UE can further be directly sent to the corenetwork element through the interface between the core network elementand the LoMo in FIG. 3. The core network element in FIG. 3 is a servicegateway S-GW.

If the LoMo performs data transmission with the core network elementdirectly, the LoMo needs to inform the mobility management entity MME ofthe address of the LoMo. The MME informs the core network element. TheMME then informs the macro base station of an address of the corenetwork element, and the macro base station forwards the address to theLoMo. The foregoing address may include: a Transport Network Layeraddress TNL address, a General Packet Radio Service TunnelingProtocol-Tunnel Endpoint Identifier GTP-TEID and/or an Internet ProtocolIP address.

A protocol stack of an air interface between a LoMo and a UE may onlyinclude: the Packet Data Convergence Protocol (PDCP), Radio Link ControlRLC layer protocol, Media Access Control MAC layer protocol, and Layer 1L1 protocol; and/or does not include: the Radio Resource Control RRClayer protocol. That is, on a control plane, simplified protocol stackarchitecture can be adopted for a protocol stack of an air interfacebetween a LoMo and a UE, for example, no RRC protocol entity isprovided, as shown in FIG. 4, on a user plane, an original user planeprotocol stack PDCP/RLC/MAC may be adopted for a LoMo and a UE, and onlythe functions are tailored, as shown in FIG. 5.

For a control plane protocol stack between a LoMo and a UE, the PDCP,RLC, and MAC may be further combined into one new layer entity, as shownin FIG. 6. For a user plane protocol stack between a LoMo and a UE, thePDCP, RLC, and MAC may be further combined into one new layer entity, asshown in FIG. 7.

When a small cell is a UE having a D2D function, before step 101, thefollowing step may be further included: Step 104. When the small cell isnear the UE, the UE initiates an RRC connection to the macro basestation to establish a service. The macro base station determines thatdata requested by the UE is stored in the small cell. That is, when ithas been determined that data requested by the UE is present in a nearbysmall cell, the macro base station directly enables the small cell totransmit the data to the UE.

The foregoing configuration message may further include: allocationinformation for a static or semi-static configuration resource; resourceallocation information for random access on the static or semi-staticconfiguration resource or resource allocation information for randomaccess and data scheduling. If the configuration message only includesthe resource allocation information for random access, after the smallcell has established the data bearer with the UE on the user planeconnection, it is further included that: the small cell sends to the UEthe resource allocation information for random access on the static orsemi-static configuration resource through the established data bearer.If the configuration message includes the static or semi-static resourceallocation information for random access and data scheduling, after thesmall cell has established the data bearer with the UE on the user planeconnection, it is further included that: the small cell sends to the UEthe resource allocation information for random access and datascheduling on the static or semi-static configuration resourceconfiguration resource through the established data bearer. Ifcongestion occurs during random access or random access and datascheduling based on the resource allocation information, it is furtherincluded that: the small cell reapplies for a static or semi-staticconfiguration resource from the macro base station; or the small cellinstructs the macro base station to hand over the UE to the macro basestation; or the small cell adopts a dynamic scheduling manner for newaccess where resource congestion occurs.

The functions of the macro base station and the LoMo are compared in thefollowing table. The LoMo column lists the functions capable of beingsimplified of a LoMo:

TABLE 1 Function Comparison Table of a Macro Base Station and a LoMoCompared Items eNB LoMo Random access Contention access/non-Non-contention channel (RACH) contention access access only Hybridautomatic HARQ Simple HARQ, for retransmission example, fewer (HARQ)retransmission times Scheduling Dynamic scheduling/semi- Simplescheduling mechanism static scheduling (SPS) Uplink scheduling Bufferstatus report For example, no information (BSR)/power headroom reportpower headroom (PHR)/scheduling priority report level processing DRX(discontinuous Long and short DRX periods For example, a reception)longer DRX period

Compared with the prior art, in the method provided in the embodiment ofthe present invention, a small cell may establish a Radio ResourceControl RRC connection with a user equipment UE through a macro basestation, and the macro base station then configures the small cell, sothat the procedure of establishing an RRC connection with a UE isomitted and cost is lowered. Next, the small cell establishes a databearer with the UE to share data traffic with the macro base station, sothat bandwidth and capacity of mobile broadband communications areincreased.

FIG. 8 is a diagram of signaling interaction of a wireless broadbandcommunication method according to an embodiment of the presentinvention. This embodiment includes:

Step 801. A UE does not directly access a LoMo, and instead, when a UEinitiates a service, establishes an RRC connection with a macro basestation first and performs normal authentication and encryption.

Step 802. The macro base station performs RRC reconfiguration on the UEto establish a corresponding second signaling radio bearer SRB 2, dataradio bearer DRB, measurement control configuration, and the like; afterreceiving an RRC reconfiguration message (RRC reconfiguration), the UEperforms bottom layer configuration, which includes radio resourceconfiguration, measurement configuration, and the like.

Step 803. The macro base station needs to complete, while sending theRRC reconfiguration message (RRC reconfiguration), the configuration ofa bottom layer user plane protocol stack (including the PDCP, RLC, andMAC) or a newly defined user plane entity (new MAC) of the LoMo throughone newly defined interface (simple IF). A configuration messagetransferred by the interface (simple IF) includes radio resourceconfiguration (logical channel configuration, transmission channelconfiguration, and physical channel configuration), measurementconfiguration, and the like.

Specifically, in an indoor coverage scenario, the number of UEs issmall, and the radio resource configuration may be a static orsemi-static RACH resource and/or a static or semi-static physicaltransmission resource. The static or semi-static resource information isset according to a resource use condition of resident users under an AP.

Here, steps 802 and 803 may be performed at the same time or performedin sequence.

Step 804. The UE and the LoMo feed a configuration response message backto the macro base station, respectively.

According to the different information transferred by the interface(simple IF), three choices are as follows:

Choice 1: Only a static or semi-static RACH resource is included, andsubsequently scheduled information is then informed by the LoMo througha MAC CE (MAC control element).

Choice 2: The configuration message includes static or semi-staticresource information for random access and subsequent scheduling of theUE, and if congestion occurs in resource allocation, the LoMo reappliesfor semi-static resource allocation from the macro base station or handsover the UE to the macro base station.

Choice 3: The configuration message includes static semi-static resourceinformation for random access and subsequent scheduling of the UE, andif resource congestion occurs during the subsequent access of the UE, adynamic scheduling manner is adopted for access after the resourcecongestion has occurred.

Step 805. The UE and the LoMo establish a user plane bearer.

The relationship between this embodiment and the embodiment in FIG. 1lies in that, in this embodiment, that the small cell receives theconfiguration message sent, through a wired or wireless interface, bythe macro base station, and performs configuration based on theconfiguration message includes: the small cell receives user planeprotocol configuration information sent, through a wired or wirelessinterface, by the macro base station, and the small cell configures aradio resource and a measurement parameter for establishing a user planeconnection with the UE.

Compared with the prior art, in the method provided in the embodiment ofthe present invention, a small cell may establish a Radio ResourceControl RRC connection with a user equipment UE through a macro basestation, and the macro base station then configures the small cell, sothat the procedure of establishing an RRC connection with a UE isomitted and cost is lowered. Next, the small cell establishes a databearer with the UE to share data traffic with the macro base station, sothat bandwidth and capacity of mobile broadband communications areincreased.

FIG. 9 is a diagram of signaling interaction of a wireless broadbandcommunication method according to an embodiment of the presentinvention. This embodiment includes the following steps.

Step 901. A UE establishes an RRC connection with a macro base stationfirst.

Step 902. The macro base station determines, according to servicequality (QoS), a scheduling policy, and/or channel quality, and the likeof a service, whether one secondary component carrier (SCC) needs to beconfigured.

Step 903. The macro base station performs SCC relevant configuration onthe UE through dedicated signaling configuration.

Step 904. The macro base station configures a LoMo through a newlydefined interface message, and the LoMo receives an SCC configurationmessage of the macro base station.

Step 905. Send an activation message to the UE through the MAC CE of theLoMo.

Step 906. After receiving the activation message, the UE performs randomaccess of the LoMo and obtains a new second cell-radio network temporaryidentifier (C-RNTI 2).

Step 907. IP data traffic splitting is performed at the macro basestation of the LTE for the downlink data, services having high QoSrequirements such as speech and video are still scheduled by primarycomponent carriers PCCs, and physical downlink control channel (PDCCH)scrambling is performed by adopting a first cell-radio network temporaryidentifier C-RNTI 1 allocated by the RRC connection; services having lowQos requirements are provided by SCCs, and pdcch scrambling is performedby adopting the C-RNTI 2 obtained through random access of the LoMo.

The relationship between this embodiment and the embodiment in FIG. 1lies in that, in this embodiment, that a small cell receives aconfiguration message sent, through a wired or wireless interface, by amacro base station, and performs configuration based on theconfiguration message includes: the small cell receives SCCconfiguration information sent, through a wired or wireless interface,by the macro base station, and the small cell configures an SCC forestablishing a user plane connection with the UE.

In this embodiment, the correlation between a PCC and an SCC ispermanent, that is to say, the link between a UE and a macro basestation is always a PCC, and the link between a UE and a LoMo is alwaysan SCC.

Compared with the prior art, in the method provided in the embodiment ofthe present invention, a small cell may establish a Radio ResourceControl RRC connection with a user equipment UE through a macro basestation, and the macro base station then configures the small cell, sothat the procedure of establishing an RRC connection with a UE isomitted and cost is lowered. Next, the small cell establishes a databearer with the UE to share data traffic with the macro base station, sothat bandwidth and capacity of mobile broadband communications areincreased.

FIG. 10 is a flow chart of another wireless broadband communicationmethod according to an embodiment of the present invention. Thisembodiment includes:

Step 1001. A small cell receives a synchronization signal Preamble sentin a first message by a UE in an idle state, and the small celldetermines that the Preamble is a dedicated Preamble; and/or the smallcell receives a display indication using a simplified RRC procedure.

Step 1002. The small cell responds in a second message indicationinformation about that a first signaling radio bearer SRB 1 and/orsecond signaling radio bearer SRB 2 does not need to be reestablished ormodified.

Step 1003. Instruct the UE to access a network through the small cell.

The execution subject in this embodiment of the present invention is asmall cell. The small cell may be: a picocell (Pico), a femtocell(Femto), or other local wireless access points AP and low mobility cells(Low Mobility, LoMo). In this embodiment, for example, the small cell isa LoMo.

In an embodiment of the present invention, the LoMo may be located at acoverage hole of the macro base station. The UE can separately reside onthe LoMo.

As shown in FIG. 11, the macro base station is connected to the LoMothrough a wired or wireless interface. The wired interface may includean S1 interface between a base station and a mobility management entityMME, and/or an X2 interface between base stations, and/or a commonpublic radio interface CPRI, and/or an Iub interface between a wirelessnetwork controller and a base station. The LoMo receives, through suchan interface, a configuration message sent by the macro base stationthrough a wired or wireless interface. The wireless interface includes aUu interface between a base station and a UE and/or a microwaveinterface for base station transmission. The LoMo may also be connectedto the UE through an air interface without a macro base station, andsuch an interface bears a signaling and data bearer between the UE andthe LoMo.

The LoMo may send, after receiving the user plane data of the UE throughthe data bearer, the user plane data to the macro base station throughthe wired or wireless interface between the macro base station and theLoMo in FIG. 11, so that the macro base station forwards the user planedata of the UE to a core network element; or, further directly send theuser plane data of the UE to the core network element through theinterface between the core network element and the LoMo in FIG. 12. Thecore network element in FIG. 12 is a service gateway S-GW.

If the LoMo performs data transmission with the core network elementdirectly, the LoMo needs to inform the mobility management entity MME ofthe address of the LoMo. The MME informs the core network element. TheMME then informs the macro base station of an address of the corenetwork element, and the macro base station forwards the address to theLoMo. The foregoing address may include a TNL address, a GTP-TEID,and/or an Internet Protocol IP address.

A protocol stack of an air interface between a LoMo and a UE may onlyinclude: On a control plane, simplified protocol stack architecture canbe adopted for a protocol stack of an air interface between a LoMo and aUE, for example, a simplified RRC protocol entity is provided, as shownin FIG. 13. As for functions, the simplified RRC procedure shown in FIG.10 may be adopted. On a user plane, an original user plane protocolstack PDCP/RLC/MAC may be adopted for a LoMo and a UE, and only thefunctions are tailored. The protocol stack is shown in FIG. 14, and thesimplified part of functions is shown in Table 1.

A control plane protocol stack between a LoMo and a UE can furthercombine the PDCP, RLC, and MAC into a new layer entity, as shown in FIG.15. A user plane protocol stack between a LoMo and a UE can furthercombine the PDCP, RLC, and MAC into a new layer entity, as shown in FIG.16.

The foregoing network configuration includes at least one of thefollowing: logical channel configuration, signaling radio bearer SRBconfiguration, MAC layer configuration, semi-static schedulingconfiguration, physical channel configuration, and an RRC message timerparameter.

If handover between small cells or handover from a small cell to a macrobase station or handover from a macro base station to a small cell needsto be executed, after the instructing the UE to access the networkthrough the small cell, the following steps are further included:

Step 1004. The small cell receives measurement control information sentby a macro base station and forwards the measurement control informationto the UE.

Step 1005. Receive a measurement report fed back by the UE and forwardthe measurement report to the macro base station.

Step 1006. If the macro base station judges that handover needs to beperformed, a handover instruction sent by the macro base station needsto be received.

In the method provided in the embodiment of the present invention, asmall cell learns whether a UE needs to reestablish or modify an SRB 1and/or an SRB 2 through determining a Preamble or display indicationsent by a UE, if it is determined not, directly responds that an SRB 1and/or SRB 2 does not need to be reestablished or modified, andinstructs the UE to access the network, so that the procedure ofestablishing an SRB 1 and/or SRB 2 is omitted and cost is lowered. Next,the UE accesses the network through the small cell to share data trafficwith the macro base station, so that bandwidth and capacity of mobilebroadband communications are increased.

FIG. 17 is a diagram of signaling interaction of another wirelessbroadband communication method according to an embodiment of the presentinvention. This embodiment includes:

Step 1701. A UE accesses a LoMo and sends a Preamble or displayindication to the LoMo.

Step 1702. The LoMo determines that an SRB 1 and/or SRB 2 does not needto be reestablished or modified.

Step 1703. The LoMo feeds back that the SRB 1 and/or SRB 2 does not needto be reestablished or modified.

Step 1704. The UE accesses a network and notifies that networkconnection has been established through one uplink RRC message, theuplink RRC message including carrying a connection request cause, aresided PLMN network, and the like.

In consideration of scenarios of low mobility and indoor coverage for aUE, both the state of a UE and the state of a network probably do notchange much, and therefore default configuration can be adopted for manyconfigurations, including logical channel configuration (a transmissionmode, a logical channel priority level, and the like), SRB configuration(a logical channel number, an configuration parameter of an RLC, alogical channel group, a logical channel priority level, a priority bitrate, and the like), MAC layer configuration (configurations such aswhether TTI bundling TTI bundling is supported, HARQ maximumretransmission times, a buffer status report BSR, a power headroomreport PHR, discontinuous reception DRX), semi-static schedulingconfiguration, physical channel configuration, and timer parameters ofsome RRC messages.

After the UE enters the LoMo to acquire the configuration initially, theUE stores the configurations for use next time. For access a next time,because both the state of the UE and the state of the network onlychange a little, the procedure of establishing an RRC connection can besignificantly simplified.

A user in an idle state accesses the LoMo and initiates a dedicatedrandom access or display indication. The LoMo can identify the UEaccording to the dedicated preamble code.

The LoMo responds a random access response message (random accessresponse) according to the identity of the UE, and in the message a bitis used for representing whether the configuration of the SRB 1 and/orSRB 2 changes. The UE determines whether a default configuration can beused for dedicated resource configuration of the UE according to thebit.

If the configurations are same, it indicates that the UE does not needto reestablish the SRB 1 and/or SRB 2. After random access is completed,the UE can directly send an uplink RRC message and do not need toprocess an RRC connection again. Such an uplink RRC message may be a newmessage or may also reuse an existing RRC connection complete (RRCconnection complete) message or an RRC connection request (RRCconnection request) message, which contains a UE ID, an establishmentcause, a selected carrier network PLMN, a dedicated NAS message, and thelike. The modification procedure is shown in the following figures.

If handover occurs, for all the following handover types, handoverjudgment and admission control take place on a macro base station, asshown in FIG. 11 and FIG. 12:

handover from a LoMo to a macro base station;

handover from a macro base station to a LoMo; and

handover from a LoMo to another LoMo.

In a process that a UE is handed over from an LTE LoMo to an LTE macrobase station, the LTE macro base station first sends a new interfacecontained measurement control message to the LTE LoMo. The LTE LoMo thensends a measurement control message to control the corresponding UE toperform measurement and send a measurement report. After receiving thecorresponding measurement report, the LTE LoMo sends a new interfacecontained measurement report (New IF message contained Measurementreport) to the LTE macro base station. The LTE macro base stationperforms handover judgment, and if access of the UE is allowed, sends anew interface contained handover command to the LTE LoMo. The LTE LoMosends a handover command to the corresponding UE. The UE is handed overto the coverage of the corresponding LTE macro base station. After theconnection with the LTE macro base station has been established, the LTEmacro base station instructs the LoMo to release the correspondingresource.

In the process that a UE is handed over from an LTE macro base stationto an LTE LoMo, the LTE macro base station first sends a MeasurementControl message to control the corresponding UE to perform measurementand send a measurement report, and then can further acquire a loadcondition of the corresponding LoMo, perform handover judgment, and whenit is confirmed that handover corresponding to the LoMo is required,send a Handover Command to the corresponding UE and LoMo. The UE thensends a handover confirm (Handover Confirm) to the LoMo. After receivingthe corresponding message, the LoMo sends a resource release request(Resource Release Request) to the LTE macro base station. In the end,the LTE macro base station releases the corresponding resource.

In the method provided in the embodiment of the present invention, asmall cell learns whether a UE needs to reestablish or modify an SRB 1and/or SRB 2 through determining a Preamble sent by the UE, if it isdetermined not, directly responds that the SRB 1 and/or SRB 2 does notneed to be reestablished or modified, and instructs the UE to access anetwork, so that the procedure of establishing an SRB 1 and/or SRB 2 isomitted and cost is lowered. The UE then accesses a network through thesmall cell to share data traffic with the macro base station, so thatbandwidth and capacity of mobile broadband communications are increased.

FIG. 18 is a structural diagram of a small cell for wireless broadbandcommunication according to an embodiment of the present invention. Thisembodiment includes:

A first connection establishment module 1801 is adapted to establish aRadio Resource Control RRC connection with a user equipment UE through amacro base station.

A configuration message receiving module 1802 is adapted to receive aconfiguration message sent, through a wired or wireless interface, bythe macro base station after the first connection establishment modulehas established the RRC connection.

A first connection and bearer establishment module 1803 is adapted toestablish a user plane connection between the small cell and the UEbased on the RRC connection and the configuration message received bythe configuration message receiving module, and establish a data bearerwith the UE on the user plane connection.

The small cell in the embodiment of the present invention can be adaptedto execute the method in the corresponding embodiment shown in FIG. 1, 8or 9.

In the small cell in the embodiment of the present invention, theconfiguration message receiving module can be adapted to receive userplane protocol configuration information sent, through a wired orwireless interface, by the macro base station after the first connectionestablishment module has established the RRC connection, so that thesmall cell further includes a radio resource and measurement parameterconfiguration module, adapted to configure a radio resource and ameasurement parameter for establishing the user plane connection withthe UE according to the user plane protocol configuration informationreceived by the configuration message receiving module.

Alternatively, the configuration message receiving module can be adaptedto receive secondary component carrier SCC configuration informationsent, through a wired or wireless interface, by the macro base station,so that the small cell further includes an activation module, adapted toactivate a secondary component carrier SCC for establishing the userplane connection with the UE according to the secondary componentcarrier SCC configuration information received by the configurationmessage receiving module.

The small cell in the embodiment of the present invention may furtherinclude a data transmission module 1804 is adapted to transmit userplane data between the UE and a core network element through the databearer established by the first connection and bearer establishmentmodule. The user plane data between the UE and the core network elementis directly transmitted through the small cell; or the user plane databetween the UE and the core network element is transmitted through apath of the UE, the small cell, the macro base station, and the corenetwork element.

In the small cell in the embodiment of the present invention the wiredinterface may include a random one of or a random combination of severalof the following: an S1 interface between a base station and a mobilitymanagement entity MME, an X2 interface between base stations, a commonpublic radio interface CPRI, and an Iub interface between a wirelessnetwork controller and a base station.

The wireless interface may include a Uu interface between a base stationand a UE and/or a microwave interface for base station transmission.

In the small cell in the embodiment of the present invention, a protocolstack of an air interface between the small cell and the UE, onlyincludes the Packet Data Convergence Protocol PDCP, Radio Link ControlRLC layer protocol, Media Access Control MAC layer protocol, and Layer 1L1 protocol; and/or does not include the Radio Resource Control RRClayer protocol.

In the small cell in the embodiment of the present invention, theconfiguration message receiving module may be further adapted to receiveallocation information of a static or semi-static configuration resourceafter the first connection establishment module has established the RRCconnection; and receive resource allocation information for randomaccess on the static or semi-static configuration resource or resourceallocation information for random access and data scheduling after thefirst connection establishment module has established the RRCconnection.

If the configuration message receiving module is adapted to receive theresource allocation information for random access, the small cell in theembodiment of the present invention may further include:

An allocation information sending module 1805 is adapted to send to theUE the resource allocation information for data scheduling on the staticor semi-static configuration resource through the established databearer.

In the small cell in the embodiment of the present invention, theallocation information sending module may be further adapted to send tothe UE the resource allocation information for random access on thestatic or semi-static configuration resource through the establisheddata bearer.

The small cell in the embodiment of the present invention may furtherinclude a reapplication module 1806, which is adapted to perform randomaccess based on the resource allocation information received by theconfiguration message receiving module, or reapplies for a static orsemi-static configuration resource from the macro base station whencongestion occurs in random access and data scheduling. Alternatively,the small cell in the embodiment of the present invention may furtherinclude a handover instruction module 1807, adapted to perform randomaccess based on the resource allocation information received by theconfiguration message receiving module, or instruct the macro basestation to hand over the UE to the macro base station when congestionoccurs in random access and data scheduling. The small cell in theembodiment of the present invention may further include a dynamicscheduling module 1808, adapted to perform random access based on theresource allocation information received by the configuration messagereceiving module, or adopt a dynamic scheduling manner for new accesswhere resource congestion occurs when congestion occurs in random accessand data scheduling.

In the small cell in the embodiment of the present invention, the smallcell may include a random one of the following: a picocell Pico, afemtocell Femto, a low mobility cell LoMo, a local wireless access pointAP, a UE having a device-to-device D2D function, and a low power nodelow power node.

Compared with the prior art, in the small cell provided in theembodiment of the present invention, a macro base station establishes aRadio Resource Control RRC connection with a user equipment UE, and themacro base station then configures the small cell, so that the procedureof establishing an RRC connection with a UE is omitted and cost islowered. Next, the small cell establishes a data bearer with the UE toshare data traffic with the macro base station, so that bandwidth andcapacity of mobile broadband communications are increased.

FIG. 19 is a structural diagram of another small cell for wirelessbroadband communication according to an embodiment of the presentinvention. This embodiment includes:

A synchronization signal receiving module 1901 is adapted to receive asynchronization signal Preamble sent in a first message by a UE in anidle state, where the small cell determines that the Preamble is adedicated Preamble; and/or a display indication receiving module isadapted to receive a display indication using a simplified RRCprocedure.

A response module 1902 is adapted to respond in a second messageindication information about that a first signaling radio bearer SRB 1and/or second signaling radio bearer SRB 2 does not need to bereestablished or modified.

An instruction module 1903 is adapted to instruct the UE to access anetwork through the small cell.

The small cell in the embodiment of the present invention may furtherinclude:

A user plane data receiving module 1904 is adapted to receive user planedata of the UE.

A user plane data sending module 1905 is adapted to send the user planedata of the UE to a macro base station, so that the macro base stationforwards the user plane data of the UE to a core network element, oradapted to send the user plane data of the UE to a core network element.

The small cell in the embodiment of the present invention may furtherinclude a measurement control information forwarding module 1906 isadapted to receive measurement control information sent by the macrobase station and forward the measurement control information to the UE.

A measurement report forwarding module 1907 is adapted to receive ameasurement report fed back by the UE and forward the measurement reportthe macro base station.

A handover instruction receiving module 1908 is adapted to receive ahandover instruction sent by the macro base station if the macro basestation judges that handover is required.

The small cell in the embodiment of the present invention may include arandom one of the following: a picocell Pico, a femtocell Femto, a lowmobility cell LoMo, and a local wireless access point AP.

In the small cell provided in the embodiment of the present invention,it is learned whether a UE needs to reestablish or modify an SRB 1and/or SRB 2 through determining a Preamble sent by a UE, if it isdetermined not, it is directly responded that the SRB 1 and/or SRB 2does not need to be reestablished or modified, and the UE is instructedto access a network, so that the procedure of establishing an SRB 1and/or SRB 2 is omitted and cost is lowered. The UE then accesses anetwork through the small cell to share data traffic with the macro basestation, so that bandwidth and capacity of mobile broadbandcommunications are increased.

FIG. 20 is a structural diagram of a macro base station for wirelessbroadband communication according to an embodiment of the presentinvention. This embodiment includes the following.

A second connection establishment module 2001 is adapted to establish aRadio Resource Control RRC connection with a UE.

A configuration message sending module 2002 is adapted to send an RRCreconfiguration message to the UE through a wireless interface after thesecond connection establishment module has established the RRCconnection, and send a configuration message to a small cell through awired or wireless interface, so that the small cell establishes a userplane connection with the UE.

The macro base station in the embodiment of the present invention can beadapted to execute the method in the corresponding embodiment shown inFIG. 25.

In the macro base station in the embodiment of the present invention,the configuration message sending module may be adapted to:

send an RRC reconfiguration message to the UE through a wirelessinterface after the second connection establishment module hasestablished the RRC connection, and send user plane protocolconfiguration information through a wired or wireless interface, so thatthe small cell establishes the user plane connection with the UE; or

send an RRC reconfiguration message to the UE through a wirelessinterface through a wired or wireless interface after the secondconnection establishment module has established the RRC connection, andsend secondary component carrier SCC configuration information, so thatthe small cell establishes the user plane connection with the UE.

In the macro base station in the embodiment of the present invention,the wired interface may include a random one of or a random combinationof several of the following: an S1 interface between a base station anda mobility management entity MME, an X2 interface between base stations,a common public radio interface CPRI, and an Iub interface between awireless network controller and a base station.

In the macro base station in the embodiment of the present invention,the wireless interface may include a Uu interface between a base stationand a UE and/or a microwave interface for base station transmission.

In the macro base station in the embodiment of the present invention,the configuration message sending module may be further adapted to sendallocation information of a static or semi-static configuration resourceafter the second connection establishment module has established the RRCconnection; and send resource allocation information for random accesson the static or semi-static configuration resource or resourceallocation information for random access and data scheduling after thesecond connection establishment module has established the RRCconnection.

The macro base station in the embodiment of the present invention mayfurther include an application receiving module 2003, adapted to receivean application for a static or semi-static configuration resource fromthe small cell; or a handover instruction receiving module 2004, adaptedto receive an instruction of handing over the UE to the macro basestation.

Compared with the prior art, the macro base station provided in theembodiment of the present invention can establish an RRC connectionbetween a UE and a picocell and then configure a small cell, so that thepicocell establishes a data bearer with the UE, and the picocell sharesthe data traffic of the macro base station; therefore, bandwidth andcapacity of mobile broadband communications are increased, and theoverall cost of the system is low.

FIG. 21 is a structural diagram of a UE according to an embodiment ofthe present invention. This embodiment includes a number of modules.

A third connection establishment module 2101 is adapted to establish aRadio Resource Control RRC connection with a macro base station.

A reconfiguration message receiving module 2102 is adapted to receive anRRC reconfiguration message sent by the macro base station to the UEafter the third connection establishment module has established the RRCconnection.

A second connection and bearer establishment module 2103 is adapted toestablish a user plane connection with the small cell based on the RRCreconfiguration message received by the reconfiguration messagereceiving module, and establish a data bearer with the small cell on theuser plane connection.

The UE in the embodiment of the present invention can be adapted toexecute the method in the corresponding embodiment shown in FIG. 26.

In the user equipment in the embodiment of the present invention, aprotocol stack of an air interface between the small cell and the UE,only includes the Packet Data Convergence Protocol PDCP, Radio LinkControl RLC layer protocol, Media Access Control MAC layer protocol, andLayer 1 L1 protocol; and/or does not include the Radio Resource ControlRRC layer protocol.

Compared with the prior art, the UE provided in the embodiment of thepresent invention can establish an RRC connection with a picocellthrough a macro base station, and establish a user plane connection withthrough the picocell RRC reconfiguration, so that the picocell sharesdata traffic of the macro base station; therefore, bandwidth andcapacity of mobile broadband communications are increased, and theoverall cost of the system is low.

FIG. 22 is a structural diagram of another UE according to an embodimentof the present invention. This embodiment includes the followingmodules.

A synchronization signal sending module 2201 is adapted to send asynchronization signal Preamble in a first message in an idle state,and/or a display indication sending module is adapted to send a displayindication using a simplified RRC procedure.

A response receiving module 2202 is adapted to receive indicationinformation about that the first signaling radio bearer SRB 1 and/orsecond signaling radio bearer SRB 2 does not need to be reestablished ormodified in the second message.

An instruction receiving module 2203 is adapted to receive aninstruction that the UE accesses a network.

The UE provided in the embodiment of the present invention enables,through sending a Preamble, the small cell to learn whether a UE needsto reestablish or modify an SRB 1 and/or SRB 2, if it is determined not,receive a response that the SRB 1 and/or SRB 2 does not need to bereestablished or modified and an instruction for the UE to access anetwork, so that the procedure of establishing an SRB 1 and/or SRB 2 isomitted and cost is lowered. The UE then accesses the network throughthe small cell to share data traffic with the macro base station, sothat bandwidth and capacity of mobile broadband communications areincreased.

FIG. 23 is a structural diagram of a wireless broadband communicationsystem according to an embodiment of the present invention. Thisembodiment includes the following.

A small cell 2301 is adapted to: establish a Radio Resource Control RRCconnection with a user equipment UE through a macro base station;receive a configuration message sent, through a wired or wirelessinterface, by a macro base station after the first connectionestablishment module has established the RRC connection; and establish auser plane connection between the small cell and a UE based on the RRCconnection and the configuration message received by the configurationmessage receiving module, and establish a data bearer with the UE on theuser plane connection.

A base station 2302 is adapted to establish a Radio Resource Control RRCconnection with a UE; send an RRC reconfiguration message to the UEthrough a wireless interface after a second connection establishmentmodule has established the RRC connection, and send a configurationmessage to a small cell through a wired or wireless interface, so thatthe small cell establishes a user plane connection with the UE.

The small cell in the embodiment of the present invention may be thesmall cell described in the corresponding embodiment in FIG. 18. Themacro base station in the embodiment of the present invention can be themacro base station described in the corresponding embodiment in FIG. 20.The UE in the embodiment of the present invention can be the UEdescribed in the corresponding embodiment in FIG. 21.

Compared with the prior art, in the system provided in the embodiment ofthe present invention, a small cell may establish a Radio ResourceControl RRC connection with a user equipment UE through a macro basestation, and the macro base station then configures the small cell, sothat the procedure of establishing an RRC connection with a UE isomitted and cost is lowered. Next, the small cell establishes a databearer with the UE to share data traffic with the macro base station, sothat bandwidth and capacity of mobile broadband communications areincreased.

FIG. 24 is a structural diagram of another wireless broadbandcommunication system according to an embodiment of the presentinvention. This embodiment includes:

A small cell 2401 is adapted to receive a synchronization signalPreamble sent in a first message by a UE in an idle state, where thesmall cell determines that the Preamble is a dedicated Preamble; and/ora display indication receiving module is adapted to receive a displayindication using a simplified RRC procedure; respond in a second messageindication information about that a first signaling radio bearer SRB 1and/or second signaling radio bearer SRB 2 does not need to bereestablished or modified; and instruct the UE to access a networkthrough the small cell.

A user equipment 2402 is adapted to send a synchronization signalPreamble in a first message in an idle state, and/or a displayindication sending module is adapted to send a display indication usinga simplified RRC procedure; receive indication information about thatthe first signaling radio bearer SRB 1 and/or second signaling radiobearer SRB 2 does not need to be reestablished or modified in a secondmessage; and receive an instruction that the UE accesses a networkthrough the small cell.

In the system provided in the embodiment of the present invention, asmall cell learns whether a UE needs to reestablish or modify an SRB 1and/or SRB 2 through determining a Preamble sent by a UE, if it isdetermined not, directly responds that the SRB 1 and/or SRB 2 does notneed to be reestablished or modified, and instructs the UE to access anetwork, so that the procedure of establishing an SRB 1 and/or SRB 2 isomitted and cost is lowered. The UE then accesses a network through thesmall cell to share data traffic with the macro base station, so thatbandwidth and capacity of mobile broadband communications are increased.

FIG. 25 is a flow chart of another wireless broadband communicationmethod according to an embodiment of the present invention. Thisembodiment includes:

Step 2501. A macro base station establishes a Radio Resource Control RRCconnection with a UE.

Step 2502. The macro base station sends an RRC reconfiguration messageto the UE through a wireless interface after establishing the RRCconnection, and sends a configuration message to a small cell through awired or wireless interface, so that the small cell establishes a userplane connection with the UE.

In the method in the embodiment of the present invention, that a macrobase station sends an RRC reconfiguration message to a UE through awireless interface after establishing an RRC connection, and sends aconfiguration message to a small cell through a wired or wirelessinterface, so that the small cell establishes a user plane connectionwith the UE may include sending the RRC reconfiguration message to theUE through a wireless interface after the RRC connection has beenestablished, and sending user plane protocol configuration informationthrough a wired or wireless interface, so that the small cellestablishes the user plane connection with the UE; or sending the RRCreconfiguration message to the UE through a wireless interface after theRRC connection has been established, and sending secondary componentcarrier SCC configuration information through a wired or wirelessinterface, so that the small cell establishes the user plane connectionwith the UE.

In the method in the embodiment of the present invention, the wiredinterface may include a random one of or a random combination of severalof the following: an S1 interface between a base station and a mobilitymanagement entity MME, an X2 interface between base stations, a commonpublic radio interface CPRI, and an Iub interface between a wirelessnetwork controller and a base station.

The wireless interface may include Uu interface between a base stationand a UE and/or a microwave interface for base station transmission.

In the macro base station in the embodiment of the present invention,the configuration message sending module may be further adapted to sendallocation information of a static or semi-static configurationresource; and send resource allocation information for random access onthe static or semi-static configuration resource or resource allocationinformation for random access and data scheduling.

The method in the embodiment of the present invention may furtherinclude the following steps.

Step 2503. Receive an application for a static or semi-staticconfiguration resource from the small cell; or receive an instruction ofhanding over the UE to the macro base station.

Compared with the prior art, in the method provided in the embodiment ofthe present invention, a macro base station can establish an RRCconnection between a UE and a picocell, and then configures a smallcell, so that the picocell establishes a data bearer with the UE, andthe picocell shares data traffic with the macro base station; therefore,bandwidth and capacity of mobile broadband communications are increased,and overall cost of the system is low.

FIG. 26 is a flow chart of another wireless broadband communicationmethod according to an embodiment of the present invention. Thisembodiment includes the following steps.

Step 2601. A UE establishes a Radio Resource Control RRC connection witha macro base station.

Step 2602. Receive an RRC reconfiguration message sent by the macro basestation to the UE after the UE has established the RRC connection.

Step 2603. The UE establishes a user plane connection with the smallcell based on the RRC reconfiguration message, and establishes a databearer with the small cell on the user plane connection.

In the method in the embodiment of the present invention, a protocolstack of an air interface between the small cell and the UE onlyincludes the Packet Data Convergence Protocol PDCP, Radio Link ControlRLC layer protocol, Media Access Control MAC layer protocol, and Layer 1L1 protocol; and/or does not include the Radio Resource Control RRClayer protocol.

Compared with the prior art, in the method provided in the embodiment ofthe present invention, the UE can establish an RRC connection with apicocell through a macro base station, and then establish a user planeconnection with the picocell through RRC reconfiguration, so that thepicocell shares data traffic with the macro base station, bandwidth andcapacity of mobile broadband communications are increased, and overallcost of the system is low.

Through the above description of the implementation, it is clear topersons skilled in the art that the present invention may beaccomplished through hardware, or through software plus a necessaryuniversal hardware platform. Based on this, the technical solutions ofthe present invention may be embodied in the form of a software product.The software product may be stored in one nonvolatile storage medium(for example, CD-ROM, USB flash drive, or removable hard disk) andcontain several instructions adapted to instruct computer equipment (forexample, a personal computer, a server, or network equipment) to performthe method according to the embodiments of the present invention.

It should be understood by persons skilled in the art that theaccompanying drawings are merely schematic diagrams of a preferredembodiment, and modules or processes in the accompanying drawings arenot necessarily required in implementing the present invention.

It should be understood by persons skilled in the art that, modules in adevice according to an embodiment may be distributed in the device ofthe embodiment according to the description of the embodiment, or becorrespondingly changed to be disposed in one or more devices differentfrom this embodiment. The modules of the above embodiment may becombined into one module, or further divided into a plurality ofsub-modules.

The sequence numbers in the embodiments of the present invention are fordescription only and do not represent preferences for embodiments.

The above descriptions are merely specific embodiments of the presentinvention, but not intended to limit the present invention. Anymodification, equivalent replacement, or improvement made by personsskilled in the art that should fall within the protection scope of thepresent invention.

What is claimed is:
 1. A user equipment comprising: a transmitter; aprocessor, adapted to establish a Radio Resource Control (RRC)connection with a macro base station; and a receiver, adapted to receivean RRC reconfiguration message sent by the macro base station to a userequipment (UE) after the processor has established the RRC connection;wherein the processor is further adapted to establish a user planeconnection with a small cell through an air interface based on thereceived RRC reconfiguration message, and establish a data bearer withthe small cell on the user plane connection, wherein the data beareronly transmits user plane data between the UE and a core network (CN)element; and wherein the transmitter is adapted to: transmit onlycontrol plane signaling through the established RRC connection to themacro base station; and transmit the user plane data only via the databearer to the small cell for sending the user plane data through themacro base station to the CN element, or transmit user plane data onlyvia the data bearer to the small cell for sending the user plane data tothe CN element.
 2. The user equipment according to claim 1, wherein aprotocol stack of the air interface between the small cell and the UE,only comprises Packet Data Convergence Protocol (PDCP), Radio LinkControl (RLC) layer protocol, Media Access Control (MAC) layer protocol,and Layer 1 L1 protocol, and/or does not comprise RRC layer protocol. 3.The user equipment according to claim 1, wherein at the same time ofestablishing the data bearer on the user plane connection, the userequipment keeps the RRC connection with the macro base station, andperforms transmission of control plane data with the macro base stationon the RRC connection.
 4. A wireless broadband communication methodcomprising: establishing, by a user equipment (UE), a Radio ResourceControl (RRC) connection with a macro base station; receiving an RRCreconfiguration message sent by the macro base station to the UE afterthe UE has established the RRC connection; establishing, by the UE, auser plane connection with a small cell through an air interface basedon the RRC reconfiguration message; and establishing a data bearer withthe small cell on the user plane connection, wherein the data bearer isonly used to transmit user plane data between the UE and a core network(CN) element; transmitting control plane signaling through theestablished RRC connection to the macro base station, wherein allcontrol plane signaling between the UE and the macro base station istransmitted through the established RRC connection to the macro basestation; and transmitting the user plane data using the data bearer tothe small cell for sending the user plane data through the macro basestation to the CN element, or transmitting the user plane data using thedata bearer to the small cell for sending the user plane data to the CNelement, wherein all user plane data between the UE and the CN elementis transmitted using the data bearer.
 5. The method according to claim4, wherein a protocol stack of the air interface between the small celland the UE, only comprises Packet Data Convergence Protocol (PDCP),Radio Link Control (RLC) layer protocol, Media Access Control (MAC)layer protocol, and Layer 1 L1 protocol, and/or does not comprise RRClayer protocol.
 6. The method according to claim 4, wherein at the sametime of establishing the data bearer on the user plane connection, theUE keeps the RRC connection with the macro base station, and performstransmission of control plane data with the macro base station on theRRC connection.
 7. A macro base station comprising: a processor,configured to: establish a Radio Resource Control (RRC) connection witha UE; send an RRC reconfiguration message to the UE through a wirelessinterface after the RRC connection is established; and send aconfiguration message to a small cell through a wired or wirelessinterface, wherein the RRC reconfiguration message and the configurationmessage are used for the small cell and the UE to establish a user planeconnection; wherein a data bearer is established between the small celland the UE on the user plane connection, wherein the data bearer isconfigured to only transmit user plane data between the UE and a corenetwork (CN) element; and wherein the RRC connection is configured totransmit only control plane signaling.
 8. The macro base stationaccording to claim 7, wherein the processor is further configured tosend the RRC reconfiguration message to the UE through a wirelessinterface after the RRC connection is established, and send user planeprotocol configuration information through a wired or wirelessinterface, wherein the RRC reconfiguration message and the configurationmessage are used for the small cell and the UE to establish the userplane connection.
 9. The macro base station according to claim 7,wherein the processor is configured to send the RRC reconfigurationmessage to the UE through a wireless interface after the the RRCconnection is established, and send secondary component carrier SCCconfiguration information through a wired or wireless interface, whereinthe RRC reconfiguration message and the configuration message are usedfor the small cell and the UE to establish the user plane connection.10. The macro base station according to claim 7, wherein the wiredinterface comprises a random one of or a random combination of severalof the following: an S1 interface between a base station and a mobilitymanagement entity MME, an X2 interface between base stations, a commonpublic radio interface CPRI, and an Iub interface between a wirelessnetwork controller and a base station; and the wireless interfacecomprises a Uu interface between a base station and a UE and/or amicrowave interface for base station transmission.
 11. The macro basestation according to claim 7, wherein the processor is furtherconfigured to: send allocation information of a static or semi-staticconfiguration resource the RRC connection is established; and sendresource allocation information for random access on the static orsemi-static configuration resource or resource allocation informationfor random access and data scheduling after the RRC connection isestablished.
 12. The macro base station according to claim 10, whereinthe processor is further configured to receive an application for astatic or semi-static configuration resource from the small cell. 13.The macro base station according to claim 10, wherein the processor isfurther configured to receive an instruction of handing over the UE tothe macro base station.